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Improving solubility and photovoltaic properties of the star-shaped molecules by synergistic effect of central tris(2-methoxyphenyl)amine and branched fluorine substituent
Dyes and Pigments ( IF 4.1 ) Pub Date : 2020-11-18 , DOI: 10.1016/j.dyepig.2020.109009
Mengbing Zhu , Qiong Wang , Linrui Duan , Hao Xia , Yingshuang Zhang , Fei Tong , Wenhong Peng , Hua Tan , Weiguo Zhu

Three star-shaped small molecular donors of TOBTC, TOBTC-1F and TOBTC-2F were developed, which adopt tris(2-methoxyphenyl)amine (TPA-OMe) as electron-donating core, as well as nonfluoro-, monofluoro- and difluoro-substituted benzo-thiadiazole as electron-withdrawing branch, respectively. The improved solubility and hole mobility were obtained in comparison to their analogues using TPA as core. More interestingly, the TOBTC-2F:PC71BM blend exhibited highest hole mobility (μh) of 8.5 × 10−4 cm2V−1s−1 and its solution-processed organic solar cell displayed the best photovoltaic properties with a power conversion efficiency of 4.5% at an area of 10 mm2 without any additive and annealing treatment. Here, the μh value is 10 times higher than that of its TPA based analogue:PC71BM blend. It indicates that the synergistic effect of the TPA-OMe unit in core and fluorine substituents in benzo-thiadiazole is available to improve solubility, mobility and photovoltaic properties of the star-shaped small molecular donors.



中文翻译:

通过中心三(2-甲氧基苯基)胺与支链氟取代基的协同作用提高星形分子的溶解度和光电性质

研发了三颗TOBTC,TOBTC-1F和TOBTC-2F的星形小分子供体,它们以三(2-甲氧基苯基)胺(TPA-OMe)为电子给体核心,以及非氟,单氟和二氟取代的苯并噻二唑分别作为吸电子分支。与使用TPA作为核心的类似物相比,获得了更高的溶解度和空穴迁移率。更有趣的是,TOBTC-2F:PC 71 BM共混物表现出最高的空穴迁移率(μ ħ的8.5×10)-4厘米2 V -1小号-1和它的溶液处理的有机太阳能电池与电源显示最好光伏特性在10 mm 2的面积上的转换效率为4.5%无需任何添加剂和退火处理。在此,μ ħ值比其基于TPA类似物的高10倍:PC 71 BM共混物。这表明TPA-OMe单元在苯并噻二唑的核心和氟取代基中具有协同作用,可用于改善星形小分子供体的溶解度,迁移率和光电性质。

更新日期:2020-11-18
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